Once the unit is installed, there are the running maintenance costs including a replacement spa filter every year (varies in cost depending on spa model, usually around $35), spa chemicals such as bromine or chlorine and other spa accessories such as spa fragrances and cleaning materials.

No matter how hot the water is in a spa or hot tub, hot tub filters are an essential piece of equipment to keep the water clean and bacteria-free. Hot tub filters are designed to keep the water sparkling clean and healthy by catching such floating debris as hair, leaves, dead bugs and dirt that could interfere with the operation of the unit's water pump in addition to making the spa water an unhealthy breeding ground for bacteria. It is important to follow the manufacturer's directions in order to use a filter that properly fits a particular spa model.